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-rw-r--r--dom/media/webaudio/AudioParam.cpp170
1 files changed, 170 insertions, 0 deletions
diff --git a/dom/media/webaudio/AudioParam.cpp b/dom/media/webaudio/AudioParam.cpp
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+++ b/dom/media/webaudio/AudioParam.cpp
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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:set ts=2 sw=2 sts=2 et cindent: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "AudioParam.h"
+#include "mozilla/dom/AudioParamBinding.h"
+#include "AudioNodeEngine.h"
+#include "AudioNodeTrack.h"
+#include "AudioContext.h"
+
+namespace mozilla::dom {
+
+NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE_CLASS(AudioParam)
+
+NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(AudioParam)
+ tmp->DisconnectFromGraphAndDestroyTrack();
+ NS_IMPL_CYCLE_COLLECTION_UNLINK(mNode)
+ NS_IMPL_CYCLE_COLLECTION_UNLINK_PRESERVED_WRAPPER
+NS_IMPL_CYCLE_COLLECTION_UNLINK_END
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(AudioParam)
+ NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mNode)
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
+
+NS_IMPL_CYCLE_COLLECTING_NATIVE_ADDREF(AudioParam)
+NS_IMPL_CYCLE_COLLECTING_NATIVE_RELEASE(AudioParam)
+
+AudioParam::AudioParam(AudioNode* aNode, uint32_t aIndex,
+ const nsAString& aName, float aDefaultValue,
+ float aMinValue, float aMaxValue)
+ : AudioParamTimeline(aDefaultValue),
+ mNode(aNode),
+ mName(aName),
+ mIndex(aIndex),
+ mDefaultValue(aDefaultValue),
+ mMinValue(aMinValue),
+ mMaxValue(aMaxValue) {}
+
+AudioParam::~AudioParam() { DisconnectFromGraphAndDestroyTrack(); }
+
+JSObject* AudioParam::WrapObject(JSContext* aCx,
+ JS::Handle<JSObject*> aGivenProto) {
+ return AudioParam_Binding::Wrap(aCx, this, aGivenProto);
+}
+
+void AudioParam::DisconnectFromGraphAndDestroyTrack() {
+ MOZ_ASSERT(mRefCnt.get() > mInputNodes.Length(),
+ "Caller should be holding a reference or have called "
+ "mRefCnt.stabilizeForDeletion()");
+
+ while (!mInputNodes.IsEmpty()) {
+ RefPtr<AudioNode> input = mInputNodes.PopLastElement().mInputNode;
+ input->RemoveOutputParam(this);
+ }
+
+ if (mNodeTrackPort) {
+ mNodeTrackPort->Destroy();
+ mNodeTrackPort = nullptr;
+ }
+
+ if (mTrack) {
+ mTrack->Destroy();
+ mTrack = nullptr;
+ }
+}
+
+mozilla::MediaTrack* AudioParam::GetTrack() const { return mTrack; }
+
+mozilla::MediaTrack* AudioParam::Track() {
+ if (mTrack) {
+ return mTrack;
+ }
+
+ AudioNodeEngine* engine = new AudioNodeEngine(nullptr);
+ mTrack = AudioNodeTrack::Create(mNode->Context(), engine,
+ AudioNodeTrack::NO_TRACK_FLAGS,
+ mNode->Context()->Graph());
+
+ // Force the input to have only one channel, and make it down-mix using
+ // the speaker rules if needed.
+ mTrack->SetChannelMixingParametersImpl(1, ChannelCountMode::Explicit,
+ ChannelInterpretation::Speakers);
+ // Mark as an AudioParam helper track
+ mTrack->SetAudioParamHelperTrack();
+
+ // Setup the AudioParam's track as an input to the owner AudioNode's track
+ AudioNodeTrack* nodeTrack = mNode->GetTrack();
+ if (nodeTrack) {
+ mNodeTrackPort = nodeTrack->AllocateInputPort(mTrack);
+ }
+
+ // Send the track to the timeline on the MTG side.
+ AudioParamEvent event(mTrack);
+ SendEventToEngine(event);
+
+ return mTrack;
+}
+
+static const char* ToString(AudioTimelineEvent::Type aType) {
+ switch (aType) {
+ case AudioTimelineEvent::SetValue:
+ return "SetValue";
+ case AudioTimelineEvent::SetValueAtTime:
+ return "SetValueAtTime";
+ case AudioTimelineEvent::LinearRamp:
+ return "LinearRamp";
+ case AudioTimelineEvent::ExponentialRamp:
+ return "ExponentialRamp";
+ case AudioTimelineEvent::SetTarget:
+ return "SetTarget";
+ case AudioTimelineEvent::SetValueCurve:
+ return "SetValueCurve";
+ case AudioTimelineEvent::Track:
+ return "Track";
+ case AudioTimelineEvent::Cancel:
+ return "Cancel";
+ default:
+ return "unknown AudioTimelineEvent";
+ }
+}
+
+void AudioParam::SendEventToEngine(const AudioParamEvent& aEvent) {
+ WEB_AUDIO_API_LOG(
+ "%f: %s for %u %s %s=%g time=%f %s=%g", GetParentObject()->CurrentTime(),
+ NS_ConvertUTF16toUTF8(mName).get(), ParentNodeId(),
+ ToString(aEvent.mType),
+ aEvent.mType == AudioTimelineEvent::SetValueCurve ? "length" : "value",
+ aEvent.mType == AudioTimelineEvent::SetValueCurve
+ ? static_cast<double>(aEvent.CurveLength())
+ : static_cast<double>(aEvent.NominalValue()),
+ aEvent.Time<double>(),
+ aEvent.mType == AudioTimelineEvent::SetValueCurve ? "duration"
+ : "constant",
+ aEvent.mType == AudioTimelineEvent::SetValueCurve
+ ? aEvent.Duration()
+ : aEvent.TimeConstant());
+
+ AudioNodeTrack* track = mNode->GetTrack();
+ if (track) {
+ track->SendTimelineEvent(mIndex, aEvent);
+ }
+}
+
+void AudioParam::CleanupOldEvents() {
+ MOZ_ASSERT(NS_IsMainThread());
+ double currentTime = mNode->Context()->CurrentTime();
+
+ CleanupEventsOlderThan(currentTime);
+}
+
+float AudioParamTimeline::AudioNodeInputValue(size_t aCounter) const {
+ MOZ_ASSERT(mTrack);
+
+ // If we have a chunk produced by the AudioNode inputs to the AudioParam,
+ // get its value now. We use aCounter to tell us which frame of the last
+ // AudioChunk to look at.
+ float audioNodeInputValue = 0.0f;
+ const AudioBlock& lastAudioNodeChunk = mTrack->LastChunks()[0];
+ if (!lastAudioNodeChunk.IsNull()) {
+ MOZ_ASSERT(lastAudioNodeChunk.GetDuration() == WEBAUDIO_BLOCK_SIZE);
+ audioNodeInputValue =
+ static_cast<const float*>(lastAudioNodeChunk.mChannelData[0])[aCounter];
+ audioNodeInputValue *= lastAudioNodeChunk.mVolume;
+ }
+
+ return audioNodeInputValue;
+}
+
+} // namespace mozilla::dom